I'm not denying it's true, but I have little patience for this argument because we can't actually do anything about it. Injustice today? Yes, we should absolutely stop that where ever we find it, but what am I supposed to do today about the fact that women could not vote in 1920? Words are cheap, actions matter. I'd much rather focus on current discrimination than dig up injustices from the past.

This is the right answer, certainly a larger factor than anything else being discussed here. In the US, women were only granted the right to vote a century ago, and a time when it was considered improper for well-to-do women to work is within the memory of many living Americans.